Xanthan Gum: What That Thickener Really Does
Xanthan gum is an FDA-permitted thickener with a JECFA rating of 'not specified,' meaning no numerical limit was set — here's what it is, and the one real exception to know.
The Short Answer
Xanthan gum is a thickener the FDA lists as an approved food additive (21 CFR 172.695), and the WHO's expert committee assigned it an acceptable daily intake of "not specified" — its most permissive category, meaning no numerical limit was needed because no adverse effects were found at realistic intakes.
What Xanthan Gum Actually Is
Xanthan gum is a carbohydrate made by fermenting sugar with a bacterium called Xanthomonas campestris. The result is a powder that thickens and stabilizes liquids in tiny amounts — which is why you'll find it in salad dressings, sauces, gluten-free baked goods, ice cream, and plant milks. It keeps oil and water from separating and gives gluten-free doughs the stretch they'd otherwise lack.
In the body, xanthan gum behaves like soluble fiber: it isn't digested or absorbed, and it passes through largely intact.
What the Regulators Actually Say
In the US, xanthan gum is a permitted food additive under 21 CFR 172.695. Internationally, JECFA — the joint FAO/WHO expert committee — evaluated it and, in 1986, assigned an acceptable daily intake of "not specified." That phrase sounds vague but means the opposite of alarming: the committee found no adverse effects and concluded a numeric cap wasn't needed at the amounts used in food.
Who Should Pay Attention
- Because it acts like soluble fiber, very large amounts can cause gas or loose stools — but the quantities in food are tiny (often well under a gram per serving).
- There is a specific, important exception for infants: xanthan gum was linked to a serious gut condition in premature babies when used in thickening products, and it should not be given to infants without medical guidance.
- Most xanthan gum is produced on corn, wheat, soy, or dairy substrates; the finished ingredient is purified, but people with severe allergies sometimes ask manufacturers about the source.
The Practical Take
For adults and older children, xanthan gum in normal foods is a well-studied, benign thickener — effectively a trace of soluble fiber doing a structural job. The one real caution is infant feeding.
Bottom Line
Xanthan gum is an FDA-permitted additive with a JECFA acceptable daily intake of "not specified" — its most permissive rating, with no numerical limit set. It's harmless for most people in the amounts food contains — the notable exception being use in infant feeding.
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Verified sources
We checked these numbers against the sources below on July 14, 2026.